Update .travis.yml to only run on dev channel
diff --git a/.travis.yml b/.travis.yml
index 07e0e42..979ab40 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,6 @@
 
 dart:
   - dev
-  - stable
+#  - stable
 
 script: ./tool/all_tests.sh